Moldex SparkPlugs® ear plugs are made of extra-soft, extra light foam. Their tapered shape fits easily in the ear canal, and seals gently and snugly without pressure. They're so comfortable you'll forget you're wearing ear plugs and offer a high NRR 33, making them suitable for most noisy environments. So, while they look like fun, they provide serious protection. Moldex SparkPlugs® also come in a metal detectable version which has a new metal detectable cord. The bright blue color is perfect for food processing applications. The enclosed metal ball bearing eliminates any exposed metal. The ball bearing and cord are in separate holes so that the ear plugs remain detectable even if the cord is removed. The ear plugs are corded to prevent ear plug loss. Random multi-colored swirl make for winning compliance to your hearing protection program. When it comes to comfort and compliance, nobody beats Moldex® to the finish line.